Kieron of SCS Astro Limited (Somerset) has helped me out yet again – this time with an extremely good price on a pair of 52mm Hutech IDAS light pollution filters. Thank you very much Kieron 🙂 Why 52mm? Because the camera rotator on the Sky 90 actually comes with a very handy 52mm filter thread. Unfortunately I don’t seem to be able to source narrowband filters in 52mm mounted diameter.
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Is it not possible to get a 50mm to 52mm converter ring?
something like http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=170484174538
Yep – but that doesn’t help the vignetting too much 🙂